please visit nearest Samsung Service Centre to fix it.I also suffered with this problems. They will replaced motherboard, battery n sensors too. Now my mobile working perfectly .
We are sorry to hear that you are facing Iris recognition issue in the device. We would request you to share device log files using error report option via Samsung member application i.e. Samsung member app> feedback>question /error > attach log file. Note: For better assistance, please send device log files within 15 minutes of issue occurrence along with the exact issue details.
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
